Bumper Cosmetics

I need to do some work on both the front and rear bumpers on my '84 cab. On the front, a previous owner drilled three holes for a license plate mount, and there are a few nicks and scrapes on it. The rear shows a few scraped areas, too. What is the best paint to retouch this with? It's sort of a semi-flat black, but can't find anything that looks exactly right. I refinished the rear apron between the exhaust tips by blasting the panel then repainting with hi-temp flat black used for barbecue pits. There was a good bit of rust and flaking paint originally, which I attributed to heat. No problems with the refinished panel, and no one has noticed or commented about the repairs. I'd like to do a similar thing to the bumpers, but don't know what to fill the holes with or paint to use. Anyone else done a similar repair?
Thanks,
Steve